Minimum working prototype

app/src/main/java/code/name/monkey/retromusic/Constants.kt

@@ -123,6 +123,7 @@ const val AUTO_DOWNLOAD_IMAGES_POLICY = "auto_download_images_policy"
 const val START_DIRECTORY = "start_directory"
 const val RECENTLY_PLAYED_CUTOFF = "recently_played_interval"
 const val LOCK_SCREEN = "lock_screen"
+const val ALBUM_ARTISTS_ONLY = "album_artists_only"
 const val ALBUM_DETAIL_SONG_SORT_ORDER = "album_detail_song_sort_order"
 const val LYRICS_OPTIONS = "lyrics_tab_position"
 const val CHOOSE_EQUALIZER = "choose_equalizer"

app/src/main/java/code/name/monkey/retromusic/fragments/LibraryViewModel.kt

@@ -12,6 +12,7 @@ import code.name.monkey.retromusic.helper.MusicPlayerRemote
 import code.name.monkey.retromusic.interfaces.MusicServiceEventListener
 import code.name.monkey.retromusic.model.*
 import code.name.monkey.retromusic.repository.RealRepository
+import code.name.monkey.retromusic.util.PreferenceUtil
 import kotlinx.coroutines.Dispatchers.IO
 import kotlinx.coroutines.launch
 
@@ -91,8 +92,14 @@ class LibraryViewModel(
     }
 
     private fun fetchArtists() {
-        viewModelScope.launch(IO) {
-            artists.postValue(repository.fetchArtists())
+        if (PreferenceUtil.albumArtistsOnly) {
+            viewModelScope.launch(IO) {
+                artists.postValue(repository.albumArtists())
+            }
+        } else {
+            viewModelScope.launch(IO) {
+                artists.postValue(repository.fetchArtists())
+            }
         }
     }
 

app/src/main/java/code/name/monkey/retromusic/repository/ArtistRepository.kt

@@ -69,7 +69,10 @@ class RealArtistRepository(
                 getSongLoaderSortOrder()
             )
         )
-        return splitIntoAlbumArtists(albumRepository.splitIntoAlbums(songs))
+
+        val sortString = if (PreferenceUtil.artistSortOrder.contains("DESC")) String.CASE_INSENSITIVE_ORDER.reversed() else String.CASE_INSENSITIVE_ORDER
+
+        return splitIntoAlbumArtists(albumRepository.splitIntoAlbums(songs)).sortedWith(compareBy(sortString) { it.name })
     }
 
     private fun splitIntoAlbumArtists(albums: List<Album>): List<Artist> {

app/src/main/java/code/name/monkey/retromusic/util/PreferenceUtil.kt

@@ -122,6 +122,13 @@ object PreferenceUtil {
             "only_wifi"
         )
 
+    var albumArtistsOnly
+        get() = sharedPreferences.getBoolean(
+            ALBUM_ARTISTS_ONLY,
+            false
+        )
+        set(value) = sharedPreferences.edit { putBoolean(ALBUM_ARTISTS_ONLY, value) }
+
     var albumDetailSongSortOrder
         get() = sharedPreferences.getStringOrDefault(
             ALBUM_DETAIL_SONG_SORT_ORDER,
@@ -150,7 +157,7 @@ object PreferenceUtil {
     var artistSortOrder
         get() = sharedPreferences.getStringOrDefault(
             ARTIST_SORT_ORDER,
-            AlbumSortOrder.ALBUM_A_Z
+            ArtistSortOrder.ARTIST_A_Z
         )
         set(value) = sharedPreferences.edit {
             putString(ARTIST_SORT_ORDER, value)

app/src/main/res/values/strings.xml

@@ -69,6 +69,8 @@
 
     <string name="action_sort_order">Sort order</string>
 
+    <string name="action_album_artists_only">Album artists only</string>
+
     <string name="action_tag_editor">Tag editor</string>
 
     <string name="action_toggle_favorite">Toggle favorite</string>
@@ -517,6 +519,7 @@
 
     <string name="pref_snow_fall_title">Snow fall effect</string>
 
+    <string name="pref_summary_album_artists_only">Show Album Artists in the Artist category</string>
     <string name="pref_summary_album_art_on_lockscreen">Use the currently playing song album cover as the lockscreen wallpaper</string>
     <string name="pref_summary_audio_ducking">Lower the volume when a system sound is played or a notification is received</string>
     <string name="pref_summary_blacklist">The content of blacklisted folders is hidden from your library.</string>
@@ -546,6 +549,7 @@
     <string name="pref_summary_toggle_shuffle">Shuffle mode will turn off when playing a new list of songs</string>
     <string name="pref_summary_toggle_volume">If enough space is available, show volume controls in the now playing screen</string>
 
+    <string name="pref_title_album_artists_only">Navigate by Album Artist</string>
     <string name="pref_title_album_art_on_lockscreen">Show album cover</string>
     <string name="pref_title_album_cover_style">Album cover theme</string>
     <string name="pref_title_album_cover_transform">Album cover skip</string>

app/src/main/res/xml/pref_ui.xml

@@ -45,6 +45,13 @@
             android:negativeButtonText="@null"
             android:positiveButtonText="@null"
             android:title="@string/pref_title_tab_text_mode" />
+
+        <code.name.monkey.appthemehelper.common.prefs.supportv7.ATESwitchPreference
+            android:defaultValue="false"
+            android:key="album_artists_only"
+            android:layout="@layout/list_item_view_switch"
+            android:summary="@string/pref_summary_album_artists_only"
+            android:title="@string/pref_title_album_artists_only" />
     </code.name.monkey.appthemehelper.common.prefs.supportv7.ATEPreferenceCategory>
 
     <code.name.monkey.appthemehelper.common.prefs.supportv7.ATEPreferenceCategory